It's good when other people can see you on your bike, but it's even better when you can see them. A parked car's not going to notice your reflectors. That one's up to you.
The Bookman Rechargeable Light is designed with an LED that can be used on two different settings: flashing and steady light. The pack includes a white light for the front and a red light for the back, both of which easily attach to your handlebars, bike stem, or frame with the attached elastic band. The small size means you can pocket the lights whenever you lock up your ride, and the large button makes them easy to turn on and off, even when you're wearing gloves.
Worried about life span? Each light lasts 5 hours when steady and 25 when flashing. When the battery is low, the back light will flash, meaning it's time for a quick recharge with the included micro USB cable.